Toshiba VF-A7 Applicable Calorific value, Heat radiation area Required Motor Inverter

■Calorific values of inverters and amount of air to be ventilated

The VF-A7 series of inverter loses about 5% of energy when switching electric currents from AC, DC, then to AC. To limit a temperature rise due to this energy loss, it is necessary to forcefully ventilate and cool down the cabinet in which the inverter is installed.

The table below lists the amounts of air to be ventilated forcefully and the heat radiation areas required for closed-type cabinets containing an inverter.

Voltage	Applicable	Calorific value	Amount of air to be	Heat radiation area	required
	motor	of inverter	ventilated forcefully	for closed-type	cabinet
class
	(kW)	(W)	(m3/min.)	(m2)
	0.4	50	0.29	1.0
	0.75	70	0.40	1.4
	1.5	110	0.63	2.2
	2.2	140	0.80	2.8
	3.7	220	1.3	4.4
	5.5	310	1.8	6.2
	7.5	420	2.4	8.4
200V	11	580	3.3	11.6
	15	770	4.4	15.4
	18.5	940	5.4	18.8
	22	1110	6.3	22.2
	30	1490	8.5	29.8
	37	1530	8.7	30.6
	45	1850	10.5	37.0
	55	2250	12.8	45.0
	75	3050	17.4	61.0
	90	3650	20.8	73.0
	0.75	70	0.40	1.4
	1.5	110	0.63	2.2
	2.2	140	0.80	2.8
	3.7	220	1.3	4.4
	5.5	280	1.6	5.6
	7.5	370	2.1	7.4
	11	530	3.0	10.6
	15	710	4.0	14.2
	18.5	800	4.6	16.0
400V	22	940	5.4	18.8
	30	1270	7.2	25.4
	37	1270	7.2	25.4
	45	1490	8.5	29.8
	55	1810	10.3	36.2
	75	2300	13.1	46.0
	90	2750	15.7	55.0
	110	3350	19.1	67.0
	132	4010	22.9	80.2
	160	4850	27.6	97.0
	220	6650	37.9	133.0
	280	8450	48.2	169.0

Note)The calorific values in the above table do not include those of optional external devices (such as input reactors, DC reactors and radio noise filters).

A-17